Summary
Growth and ethanol production by three strains (MSN77, thermotolerant, SBE15, osmotolerant and wild type ZM4) of the bacterium Zymomonas mobilis were tested in a rich medium containing the hexose fraction from a cellulose hydrolysate (Aspen wood). The variations of yield and kinetic parameters with fermentation time revealed an inhibition of growth by the ethanol produced. This inhibition may result from the increase in medium osmolality due to ethanol formation from glucose.
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Abbreviations
- S:
-
glucose concentration (g/L)
- C:
-
conversion of glucose (%)
- t:
-
fermentation time (h)
- qS :
-
specific glucose uptake rate (g/g.h)
- qp :
-
specific ethanol productivity (g/g.h)
- Qp :
-
volumetric ethanol productivity (g/L.h)
- QX :
-
volumetric biomass productivity (g/L.h)
- YX/S :
-
biomass yield (g/g)
- Yp/S :
-
ethanol yield (g/g)
- Μ:
-
specific growth rate (h-1)
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Kademi, A., Baratti, J. Batch fermentation kinetics of ethanol production by Zymomonas mobilis on cellulose hydrolysate. Biotechnol Lett 18, 643–648 (1996). https://doi.org/10.1007/BF00130758
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DOI: https://doi.org/10.1007/BF00130758